u/BlitzotheDeStrOyEr

(This might be a really stupid question)
I just started using GarageBand a week ago cause I was bored. I've been messing around with music production and making random songs blah blah blah. I came across a loop I liked (Deep Dream synth) and i wanted to extract the chord progression from it. Is there any function in GarageBand that can do this?
I tried doing it manually - all i could get was (G#,C - F,C - C,Eb - G,C) which doesn't give me a good idea of the key/ where the tonal centre is.